Add README

Author: queueRAM

README.md

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+# Texture64
+N64 texture ripper and editor
+
+![ScreenShot](https://i.imgur.com/GlNDv7W.png)
+
+## Current Features
+* Export or import N64 textures of the following formats:
+   * RGBA16
+   * RGBA32
+   * IA16
+   * IA8
+   * IA4
+   * I8
+   * I4
+   * CI8
+   * CI4
+   * 1bpp
+* Load palette from separate file
+* Split palette mode to point part of palette to non-contiguous area
+* Multiplatform. Tested under Windows 7 and under mono on Linux
+
+### Usage ###
+* Right-click image to extract to image file (.png, .jpg, .bmp)
+* Left-click to advance offset by the entire image
+   * Hold Ctrl modifier to reverse by entire image
+   * Hold Shift modifier to advance/reverse by one pixel (varies by format)
+* Click "Insert..." to import image in place at current offset (does not overwrite file)
+* Click "Save" to overwrite opened file
+
+### Changelog ###
+
+0.0.1: Beta test release
+* supports RGBA16, RGBA32, IA16, IA8, IA4, I8, I4, CI8, CI4, 1bpp
+* right-click export, insert to import
+* ctrl/shift modifiers to advance/reverse offset